The correct answer is: C. Sapphire
Sapphire is a gemstone variety of the mineral corundum, an aluminum oxide. Corundum is the same mineral as ruby, but sapphires are blue or a different color due to trace elements. Sapphires are found in many parts of the world, including Australia, Brazil, China, India, Madagascar, and the United States.
The Paddar area of Doda district in Jammu and Kashmir is known for its sapphire mines. The sapphires from Paddar are prized for their deep blue color and clarity. They are used in jewelry and other decorative items.
Coal is a fossil fuel formed from the remains of ancient plants and animals. It is a black or brown solid that is found in layers in the Earth’s crust. Coal is used to generate electricity, produce steel, and make other products.
Limestone is a sedimentary rock composed of calcium carbonate. It is a common rock that is used in construction, agriculture, and other industries.
Borax is a mineral that is used in many different products, including detergents, cosmetics, and glass. It is a white, powdery substance that is found in nature.